THE GEOLOGIST. 
matrix, with calcareous cement. Many of the grains are obscure 
foraminifera and debris of shells., etc. Mr. Parker has detected the 
following foraminifera in this matrix : — Glohigerina bulloides, Truu' 
catulina lohatula, Planorhulina mnmonoides (Quart. Journ. Geol. 
Soc, vol. xvi. p. 300), and Calcarma rarisjnna. 
Dr. Carpenter's allusion to this Heterostegina-rock as being found 
in fissures in Malta, appears to be incorrect (Introd. Foramiuif. 
Kay Soc, 1862, p. 288). 
In some places this bed contains a large quantity of green grains. 
These may prove, on examination by the microscope, to be casts of 
the cells of foraminifera, bryozoa, etc., as Bailey and Ehrenberg have 
shown other sands of silicate of iron really to be. Captain Spratt 
and Professor E. Forbes {loc. cit.') notice the occurrence of cetacean 
bones in this bed, and of oysters with the HeterosteginjB. 
The bed No. 3, blue marl, about 100 feet thick, is not yet known 
to contain foraminifera ; but should be examined with careful mani- 
pulation, as described in the ' Geologist,' vol. ii. p. 244. 
' No. 4, the freestone, consists of four or five divisions that run one 
into the other, lying in no regular order. The building-stone is that 
in which most of the Echinodermata are found. Captain Hutton 
and Dr. Adams state that the Heterostegina occurs in the freestone; 
the latter points out that it is much rarer than in No. 2, " and only 
in a drab or light-blue portion towards the upper parts of the bed." 
In Professor E. Forbes's list {op. cit. p. 230), Cristellaria and Nodo- 
saria are said to occur in the upper division of this freestone ; and 
within the last few days Captain Spratt has obligingly shown me the 
specimens referred to. They comprise Nodosaria RapJianus, JV. Ha- 
phanistrum, N. Hadicula, Dentalina acicula, D. pauperata, Lingulina 
costata, Frondicularia annularis, Cristellaria calcar^ and C. cassis. 
No doubt numerous smaller forms will also be found ; for these are 
the larger specimens of such a group of foraminifera as D'Orbigny 
has figured and described in his Foram. Foss. Bassin. Tert. de Vienne. 
Some of the specimens are yellowish, some are greyish, indicating at 
least two beds or seams that are rich with them. 
No. 5 is the hard whitish limestone, also used for building ; it is 
very variable in lithological character. Captain Hutton says, and 
more than 400 feet thick ; he adds, that " it is at the top of this bed 
only that Scutella suhrotunda is found." I find, by specimens that 
have been shown to me, that it also contains, in large abundance, 
Operculina complanata and Orhitoides dispansiis. 
The Operculinse (which appear to be two subvarieties) occur gre- 
gariously in the upper part of the limestone, are associated with 
Scutella suhrotunda and Ecliinolampas scutiformis, and "are very com- 
mon at the fault at Migiar Selimi in Gozo, and at various points 
along the northern coast of Malta." (Dr. A. L. Adams.) A large 
hand-specimen that Captain Hutton has kindly given me, couies 
from Marsa Scala, Malta. 
[We must remember that the so-called " Lenticulites complanatus'^ 
